...etonInstance = new Singleton()一行）。好在有聪明人，研究出了Double-check。 version 2.2: Double-check （有问题版） class Singleton { private static Singleton singletonInstance; // A private Singleton (){} ...
...pm ERR! npm ERR! If you believe this might be a permissions issue, please double-check the npm ERR! permissions of the file and its containing directories, or try running npm ERR! the command agai...
...pm ERR! npm ERR! If you believe this might be a permissions issue, please double-check the npm ERR! permissions of the file and its containing directories, or try running npm ERR! the command agai...
...实际上会对程序的执行效率造成负面影响。 双重检查（Double-Check） 代码二相对于代码一的效率问题，其实是为了解决1%几率的问题，而使用了一个100%出现的防护盾。那有一个优化的思路，就是把100%出现的防护盾，也改为1%的几...
... 2. If a task can be successfully queued, then we still need * to double-check whether we should have added a thread * (because existing ones died since last checking) or that ...
...pm ERR! npm ERR! If you believe this might be a permissions issue, please double-check the npm ERR! permissions of the file and its containing directories, or try running npm ERR! the command agai...
...，是否有在上线高峰期操作记录，部署过程中是否执行了double-check，在哪个阶段执行了回滚等等，来形成一个个的打分项。 其次是如何去制定风险量化的标准，也就是如何用各个指标去构造一个最佳实践。这更像是一个数学建...
... return instance; } } 这种写法用了两个if判断，也就是Double-Check，并且同步的不是方法，而是代码块，效率较高，是对第三种写法的改进。为什么要做两次判断呢？这是为了线程安全考虑，还是那个场景，对象还没实例化，两...
... 2. If a task can be successfully queued, then we still need * to double-check whether we should have added a thread * (because existing ones died since last checking) or that ...
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